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An anonymous reader writes "NewScientist reports, 'Along with birthdays, names of pets and ascending number sequences, add one more thing to the list of password no-nos: good grammar.' Researchers from Carnegie Mellon University seem to have developed a password cracking algorithm that targets grammatically correct passwords. Can bad grammar really make your password secure?"

Actually, no.
Phone numbers contain much context (e.g. area code), and they have a very limited alphabet (just the numbers 0-9). A random password can use a much larger alphabet and contains much less context. So, memorizing a ten character password is definitely harder than a ten digit phone number.